A 76-year-old male patient with a history of ischemic cardiomyopathy with severe LV systolic dysfunction (LV EF of 20%), remote myocardial infarction, and severe coronary artery disease (chronic total occlusion of the right coronary artery, severe stenosis of the proximal circumflex artery, first marginal artery, and of the left anterior descending coronary artery, treated with PCI and stent implantation: two stents in the proximal LAD coronary artery) is admitted to the Cardiology Department for pre-syncope and palpitations accompanied by dyspnea, anxiety, and chest pain. His ECG recorded in the Cardiology Department is presented in Fig. 1.